Abstract
Hydraulic properties of leaf blade were studied to provide basic knowledge to examine relationships between leaf vulnerability to hydraulic dysfunction due to low water potential (Ψ) and plant adaptation to water stress in rice. The objectives were to find the appropriate portion along a leaf blade for measurements of hydraulic dysfunction due to low Ψ and to examine whether leaf vulnerability to hydraulic dysfunction changed with the growing season. The early cultivar Bouzu (to supply materials earlier) and Koshihikari (a leading cultivar of Japan) were grown in pots. Hydraulic profile along a leaf blade was determined under well-watered and drought conditions in the two cultivars. The vulnerability to leaf hydraulic dysfunction was compared between plants sown at different dates only in Koshihikari. In both cultivars, leaf hydraulic conductivity (K) was constant in the basal half of a leaf blade, whereas it became smaller toward the tip and this pattern was maintained under drought conditions, indicating that the basal half was an appropriate portion for estimation of leaf hydraulic dysfunction. In Koshihikari, K decreased as relative water content (RWC) decreased and RWC at which K was reduced to 50% of the maximum (RWC K50) was determined for each sowing date. Then leaf Ψ corresponding to RWC K50 (Ψ K50) was estimated from the relationship between Ψ and RWC. As a sowing date was delayed from May to August, Ψ K50 increased from -1.44 MPa to -1.13 MPa. It was concluded that rice leaves became vulnerable to hydraulic dysfunction due to low Ψ as the growing season was delayed.
| Original language | English |
|---|---|
| Pages (from-to) | 22-27 |
| Number of pages | 6 |
| Journal | Plant Production Science |
| Volume | 5 |
| Issue number | 1 |
| Publication status | Published - 2002 |
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Keywords
- Growing season
- Hydraulic conductivity
- Leaf
- Rice
- Vulnerability to hydraulic dysfunction
ASJC Scopus subject areas
- Agricultural and Biological Sciences (miscellaneous)
- Agronomy and Crop Science
Cite this
Vulnerability to hydraulic dysfunction as affected by sowing date in rice leaves. / Makoto, Tsuda; Hiromi, Tanaka.
In: Plant Production Science, Vol. 5, No. 1, 2002, p. 22-27.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Vulnerability to hydraulic dysfunction as affected by sowing date in rice leaves
AU - Makoto, Tsuda
AU - Hiromi, Tanaka
PY - 2002
Y1 - 2002
N2 - Hydraulic properties of leaf blade were studied to provide basic knowledge to examine relationships between leaf vulnerability to hydraulic dysfunction due to low water potential (Ψ) and plant adaptation to water stress in rice. The objectives were to find the appropriate portion along a leaf blade for measurements of hydraulic dysfunction due to low Ψ and to examine whether leaf vulnerability to hydraulic dysfunction changed with the growing season. The early cultivar Bouzu (to supply materials earlier) and Koshihikari (a leading cultivar of Japan) were grown in pots. Hydraulic profile along a leaf blade was determined under well-watered and drought conditions in the two cultivars. The vulnerability to leaf hydraulic dysfunction was compared between plants sown at different dates only in Koshihikari. In both cultivars, leaf hydraulic conductivity (K) was constant in the basal half of a leaf blade, whereas it became smaller toward the tip and this pattern was maintained under drought conditions, indicating that the basal half was an appropriate portion for estimation of leaf hydraulic dysfunction. In Koshihikari, K decreased as relative water content (RWC) decreased and RWC at which K was reduced to 50% of the maximum (RWC K50) was determined for each sowing date. Then leaf Ψ corresponding to RWC K50 (Ψ K50) was estimated from the relationship between Ψ and RWC. As a sowing date was delayed from May to August, Ψ K50 increased from -1.44 MPa to -1.13 MPa. It was concluded that rice leaves became vulnerable to hydraulic dysfunction due to low Ψ as the growing season was delayed.
AB - Hydraulic properties of leaf blade were studied to provide basic knowledge to examine relationships between leaf vulnerability to hydraulic dysfunction due to low water potential (Ψ) and plant adaptation to water stress in rice. The objectives were to find the appropriate portion along a leaf blade for measurements of hydraulic dysfunction due to low Ψ and to examine whether leaf vulnerability to hydraulic dysfunction changed with the growing season. The early cultivar Bouzu (to supply materials earlier) and Koshihikari (a leading cultivar of Japan) were grown in pots. Hydraulic profile along a leaf blade was determined under well-watered and drought conditions in the two cultivars. The vulnerability to leaf hydraulic dysfunction was compared between plants sown at different dates only in Koshihikari. In both cultivars, leaf hydraulic conductivity (K) was constant in the basal half of a leaf blade, whereas it became smaller toward the tip and this pattern was maintained under drought conditions, indicating that the basal half was an appropriate portion for estimation of leaf hydraulic dysfunction. In Koshihikari, K decreased as relative water content (RWC) decreased and RWC at which K was reduced to 50% of the maximum (RWC K50) was determined for each sowing date. Then leaf Ψ corresponding to RWC K50 (Ψ K50) was estimated from the relationship between Ψ and RWC. As a sowing date was delayed from May to August, Ψ K50 increased from -1.44 MPa to -1.13 MPa. It was concluded that rice leaves became vulnerable to hydraulic dysfunction due to low Ψ as the growing season was delayed.
KW - Growing season
KW - Hydraulic conductivity
KW - Leaf
KW - Rice
KW - Vulnerability to hydraulic dysfunction
UR - http://www.scopus.com/inward/record.url?scp=0036222019&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0036222019&partnerID=8YFLogxK
M3 - Article
AN - SCOPUS:0036222019
VL - 5
SP - 22
EP - 27
JO - Plant Production Science
JF - Plant Production Science
SN - 1343-943X
IS - 1
ER -